added "DB dump" tool, WIP

dump-db/inc/data_key.js

@@ -0,0 +1,33 @@
+import crypto from "crypto";
+import sql from "./sql.js";
+
+function getDataKey(password) {
+    const passwordDerivedKey = getPasswordDerivedKey(password);
+
+    const encryptedDataKey = getOption('encryptedDataKey');
+
+    const decryptedDataKey = decrypt(passwordDerivedKey, encryptedDataKey, 16);
+
+    return decryptedDataKey;
+}
+
+function getPasswordDerivedKey(password) {
+    const salt = getOption('passwordDerivedKeySalt');
+
+    return getScryptHash(password, salt);
+}
+
+function getScryptHash(password, salt) {
+    const hashed = crypto.scryptSync(password, salt, 32,
+        {N: 16384, r:8, p:1});
+
+    return hashed;
+}
+
+function getOption(name) {
+    return sql.getValue("SELECT value FROM options WHERE name = ?", name);
+}
+
+module.exports = {
+    getDataKey
+};

dump-db/inc/decrypt.js

@@ -0,0 +1,79 @@
+import crypto from "crypto";
+
+function decryptString(dataKey, cipherText) {
+    const buffer = decrypt(dataKey, cipherText);
+
+    if (buffer === null) {
+        return null;
+    }
+
+    const str = buffer.toString('utf-8');
+
+    if (str === 'false') {
+        throw new Error("Could not decrypt string.");
+    }
+
+    return str;
+}
+
+function decrypt(key, cipherText, ivLength = 13) {
+    if (cipherText === null) {
+        return null;
+    }
+
+    if (!key) {
+        return "[protected]";
+    }
+
+    try {
+        const cipherTextBufferWithIv = Buffer.from(cipherText.toString(), 'base64');
+        const iv = cipherTextBufferWithIv.slice(0, ivLength);
+
+        const cipherTextBuffer = cipherTextBufferWithIv.slice(ivLength);
+
+        const decipher = crypto.createDecipheriv('aes-128-cbc', pad(key), pad(iv));
+
+        const decryptedBytes = Buffer.concat([decipher.update(cipherTextBuffer), decipher.final()]);
+
+        const digest = decryptedBytes.slice(0, 4);
+        const payload = decryptedBytes.slice(4);
+
+        const computedDigest = shaArray(payload).slice(0, 4);
+
+        if (!arraysIdentical(digest, computedDigest)) {
+            return false;
+        }
+
+        return payload;
+    }
+    catch (e) {
+        // recovery from https://github.com/zadam/trilium/issues/510
+        if (e.message && e.message.includes("WRONG_FINAL_BLOCK_LENGTH")) {
+            log.info("Caught WRONG_FINAL_BLOCK_LENGTH, returning cipherText instead");
+
+            return cipherText;
+        }
+        else {
+            throw e;
+        }
+    }
+}
+
+function arraysIdentical(a, b) {
+    let i = a.length;
+    if (i !== b.length) return false;
+    while (i--) {
+        if (a[i] !== b[i]) return false;
+    }
+    return true;
+}
+
+function shaArray(content) {
+    // we use this as simple checksum and don't rely on its security so SHA-1 is good enough
+    return crypto.createHash('sha1').update(content).digest();
+}
+
+module.exports = {
+    decrypt,
+    decryptString
+};

dump-db/inc/sql.js

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+const Database = require("better-sqlite3");
+let dbConnection;
+
+const openDatabase = (documentPath) => { dbConnection = new Database(documentPath, { readonly: true }) };
+
+const getRow = (query, params = []) => dbConnection.prepare(query).get(params);
+const getRows = (query, params = []) => dbConnection.prepare(query).all(params);
+const getValue = (query, params = []) => dbConnection.prepare(query).pluck().get(params);
+const getColumn = (query, params = []) => dbConnection.prepare(query).pluck().all(params);
+
+module.exports = {
+    openDatabase,
+    getRow,
+    getRows,
+    getValue,
+    getColumn
+};